U.S. patent number 10,916,990 [Application Number 15/698,925] was granted by the patent office on 2021-02-09 for motor with bracket.
This patent grant is currently assigned to LG Electronics Inc.. The grantee listed for this patent is LG ELECTRONICS INC.. Invention is credited to Eunji Hwang, Byungjik Kim, Sunggi Kim.
![](/patent/grant/10916990/US10916990-20210209-D00000.png)
![](/patent/grant/10916990/US10916990-20210209-D00001.png)
![](/patent/grant/10916990/US10916990-20210209-D00002.png)
![](/patent/grant/10916990/US10916990-20210209-D00003.png)
![](/patent/grant/10916990/US10916990-20210209-D00004.png)
![](/patent/grant/10916990/US10916990-20210209-D00005.png)
![](/patent/grant/10916990/US10916990-20210209-D00006.png)
![](/patent/grant/10916990/US10916990-20210209-D00007.png)
![](/patent/grant/10916990/US10916990-20210209-D00008.png)
![](/patent/grant/10916990/US10916990-20210209-D00009.png)
![](/patent/grant/10916990/US10916990-20210209-D00010.png)
View All Diagrams
United States Patent |
10,916,990 |
Hwang , et al. |
February 9, 2021 |
Motor with bracket
Abstract
A motor includes a motor body, a bracket installed in the motor
body, a rotating shaft, a bearing accommodated inside the bracket
and supporting the rotating shaft, and a bearing supporter defining
a plurality of pores. The bracket and the bearing define a bearing
heat dissipation flow path between an outer surface of the bearing
and an inner surface of the bracket, and the bearing heat
dissipation flow path is configured to pass air therethrough. The
bearing supporter is disposed in the bearing heat dissipation flow
path, and the bracket defines a bracket through-hole configured to
discharge air that has passed through the plurality of pores of the
bearing supporter.
Inventors: |
Hwang; Eunji (Seoul,
KR), Kim; Sunggi (Seoul, KR), Kim;
Byungjik (Seoul, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
LG ELECTRONICS INC. |
Seoul |
N/A |
KR |
|
|
Assignee: |
LG Electronics Inc. (Seoul,
KR)
|
Family
ID: |
1000005352999 |
Appl.
No.: |
15/698,925 |
Filed: |
September 8, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20180076682 A1 |
Mar 15, 2018 |
|
Foreign Application Priority Data
|
|
|
|
|
Sep 9, 2016 [KR] |
|
|
10-2016-0116746 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02K
5/20 (20130101); H02K 5/161 (20130101); H02K
9/06 (20130101); H02K 5/1732 (20130101) |
Current International
Class: |
H02K
5/16 (20060101); H02K 9/06 (20060101); H02K
5/20 (20060101); H02K 5/173 (20060101) |
Field of
Search: |
;310/62,60R,65 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
102005010459 |
|
Sep 2006 |
|
DE |
|
2899414 |
|
Jul 2015 |
|
EP |
|
H06311690 |
|
Nov 1994 |
|
JP |
|
2014220998 |
|
Nov 2014 |
|
JP |
|
10-1287468 |
|
Jul 2013 |
|
KR |
|
1412591 |
|
Jun 2014 |
|
KR |
|
2016097885 |
|
Aug 2016 |
|
KR |
|
WO-2006094894 |
|
Sep 2006 |
|
WO |
|
Other References
Received STIC search reports from EIC 2800 searcher Miner Christian
on Jul. 10, 2019 for claim 19. (Year: 2019). cited by examiner
.
Received STIC search reports from EIC 2800 searcher John Digeronimo
on Jul. 9, 2019 for claim 5. (Year: 2019). cited by examiner .
Received STIC search reports from EIC 2800 searcher Steve Chung on
Jul. 9, 2019 for claim 1. (Year: 2019). cited by examiner .
Extended European Search Report in European Application No.
17190140.8, dated Jan. 29, 2018, 8 pages. cited by
applicant.
|
Primary Examiner: Ismail; Shawki S
Assistant Examiner: Kyaw; Htet Z
Attorney, Agent or Firm: Fish & Richardson P.C.
Claims
What is claimed is:
1. A motor comprising: a motor body; a bracket installed in the
motor body; a rotating shaft; a bearing accommodated inside the
bracket and supporting the rotating shaft; and a bearing supporter
defining a plurality of pores, wherein the bracket and the bearing
define a bearing heat dissipation flow path between an outer
surface of the bearing and an inner surface of the bracket, the
bearing heat dissipation flow path being configured to pass air
therethrough, wherein the bearing supporter is disposed in the
bearing heat dissipation flow path, and wherein the bracket
defines: a rotating shaft through-hole through which the rotating
shaft rotatably passes, and at least one bracket through-hole that
is spaced apart from the rotating shaft through-hole, that faces
one or more of the plurality of pores, and that is configured to
discharge air that has passed through the plurality of pores of the
bearing supporter.
2. The motor according to claim 1, wherein the bearing supporter
comprises a metal wire mesh in which at least one metal wire has
one or more curved portions.
3. The motor according to claim 1, wherein the bearing supporter
has a hollow cylindrical shape, and wherein the bearing supporter
has an inner surface that contacts the outer surface of the
bearing, and an outer surface that contacts the inner surface of
the bracket.
4. The motor according to claim 1, wherein the at least one bracket
through-hole is defined at a position radially outward relative to
the rotating shaft through-hole, and wherein the bearing is
disposed radially between the rotating shaft through-hole and the
at least one bracket through-hole.
5. A motor comprising: a motor housing; a rotating shaft assembly
that includes a rotating shaft, a rotor, and a bearing, wherein the
rotor and the bearing are mounted to the rotating shaft; a bearing
supporter defining a plurality of pores; a stator installed in the
motor housing, the stator surrounding the rotor; an impeller
connected to the rotating shaft; an impeller cover that surrounds
an outer circumference of the impeller, the impeller cover defining
an air inlet between the impeller and the impeller cover; a
diffuser disposed inside the impeller cover; and a bracket coupled
to at least one of the motor housing, the impeller cover, or the
diffuser, wherein the bearing and the bracket define a bearing heat
dissipation flow path between an outer surface of the bearing and
an inner surface of the bracket, the bearing heat dissipation flow
path being configured to pass air, wherein the bearing supporter is
disposed in the bearing heat dissipation flow path, and wherein the
bracket defines: a rotating shaft through-hole through which the
rotating shaft rotatably passes, and at least one bracket
through-hole that is spaced apart from the rotating shaft
through-hole, that faces one or more of the plurality of pores, and
that is configured to discharge air that has passed through the
plurality of pores of the bearing supporter.
6. The motor according to claim 5, wherein the bearing supporter
has an end part facing toward the rotor.
7. The motor according to claim 5, wherein the diffuser includes a
guide vane configured to guide air toward a gap between the bearing
supporter and the rotor.
8. The motor according to claim 5, wherein the bearing comprises:
an inner rim fixed to the rotating shaft; an outer rim spaced apart
from the inner rim; and a rolling member disposed between the inner
rim and the outer rim, wherein the bracket comprises: a bearing
supporter housing part that surrounds an outer circumference of the
bearing supporter, and a cover part that extends from the bearing
supporter housing part and covers a portion of the bearing between
the inner rim and the outer rim, the cover part being positioned
opposite the impeller, and wherein the at least one bracket
through-hole is defined in at least one of the bearing supporter
housing part or the cover part.
9. The motor according to claim 8, wherein the cover part defines
the at least one bracket through-hole at a position that faces the
bearing supporter, and wherein the at least one bracket
through-hole is open in an axial direction.
10. The motor according to claim 9, wherein the cover part and the
impeller define a first gap configured to receive the air that has
passed through the at least one bracket through-hole, and wherein
the diffuser and the impeller define a second gap that is
configured to discharge the air that has passed through the first
gap.
11. The motor according to claim 10, wherein the at least one
bracket through-hole is located between the first gap and the
bearing supporter and faces each of the first gap and the bearing
supporter.
12. The motor according to claim 5, wherein the bearing comprises:
an inner rim fixed to the rotating shaft; an outer rim spaced apart
from the inner rim; and a rolling member disposed between the inner
rim and the outer rim, wherein the bracket comprises a bearing
supporter housing part that surrounds the bearing supporter,
wherein the bearing supporter housing part defines the at least one
bracket through-hole, and wherein the diffuser defines a diffuser
through-hole that extends to a space between the diffuser and the
impeller cover, the diffuser through-hole being configured to
communicate with the at least one bracket through-hole.
13. The motor according to claim 5, wherein the bearing supporter
comprises a metal wire mesh in which at least one metal wire has
one or more of curved portions.
14. The motor according to claim 5, wherein the bearing supporter
has a hollow cylindrical shape, and wherein the bearing supporter
has an inner surface that contacts the outer surface of the
bearing, and an outer surface that contacts the inner surface of
the bracket.
15. The motor according to claim 5, wherein the bearing comprises:
an inner rim fixed to the rotating shaft; an outer rim spaced apart
from the inner rim; and a rolling member disposed between the inner
rim and the outer rim, wherein the bracket comprises a bearing
supporter housing part that surrounds the bearing supporter,
wherein the bearing supporter has an external diameter less than an
internal diameter of the bearing supporter housing part, and
wherein the bearing heat dissipation flow path has a hollow
cylindrical shape and is defined between an outer circumference of
the outer rim and an inner circumference of the bearing supporter
housing part.
16. The motor according to claim 5, further comprising: a second
bearing mounted to the rotating shaft; and a second bearing
supporter defining a plurality of pores, wherein the motor housing
includes a hollow part that has an inner diameter greater than an
outer diameter of the rotating shaft, wherein the second bearing
has an outer diameter less than the inner diameter of the hollow
part and is located between the rotating shaft and the hollow part,
wherein the hollow part and the second bearing define a second
bearing heat dissipation flow path between an inner surface of the
hollow part and an outer surface of the second bearing, and wherein
the second bearing supporter is disposed in the second bearing heat
dissipation flow path.
17. The motor according to claim 16, wherein the motor housing
defines at least one air outlet that faces the second bearing
supporter.
18. The motor according to claim 16, wherein the second bearing
supporter has an end part facing toward the rotor.
19. A motor comprising: a motor housing; a rotating shaft assembly
including a rotating shaft, a rotor, and a bearing, wherein the
rotor and the bearing are mounted to the rotating shaft; a stator
installed in the motor housing, the stator surrounding the rotor;
an impeller connected to the rotating shaft; an impeller cover
surrounding an outer circumference of the impeller, the impeller
cover defining an air inlet between the impeller and the impeller
cover; a diffuser disposed inside the impeller cover; a bracket
mounted to at least one of the impeller cover, the motor housing,
or the diffuser; and a bearing supporter disposed between the
bracket and the bearing, the bearing supporter defining a plurality
of pores, wherein the bearing comprises: an inner rim fixed to the
rotating shaft, an outer rim spaced apart from the inner rim, and a
rolling member disposed between the inner rim and the outer rim,
wherein the bracket comprises: a bearing supporter housing part
that surrounds the bearing supporter, and a cover part that extends
from the bearing supporter housing part and covers a portion of the
bearing between the inner rim and the outer rim, wherein the cover
part defines: a rotating shaft through-hole through which the
rotating shaft rotatably passes, and at least one first bracket
through-hole that is spaced apart from the rotating shaft
through-hole and that faces the plurality of pores, wherein the
bearing supporter housing part defines at least one second bracket
through-hole that is spaced apart from the rotating shaft
through-hole, wherein the diffuser defines a diffuser through-hole
that extends to a space between the diffuser and the impeller
cover, the diffuser through-hole being configured to communicate
with the at least one second bracket through-hole, and wherein the
first and second bracket through-holes extend toward different
directions from each other.
20. The motor according to claim 19, wherein the bearing supporter
has an inner surface that contacts an outer surface of the outer
rim, and an outer surface that contacts an inner surface of the
bearing supporter housing part.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. .sctn. 119
and 365 to Korean Patent Application No. 10-2016-0116746 filed on
Sep. 9, 2016, which is hereby incorporated by reference in its
entirety.
FIELD
The present disclosure relates to a motor, and more particularly,
to a motor including a bearing.
BACKGROUND
A motor may be installed in a household appliance such as a vacuum
cleaner. For example, a motor in a vacuum cleaner may generate a
driving force for suctioning dust into a dust collecting part.
An example motor may include a motor housing, a stator installed in
the motor housing, a rotor rotated by the stator, and a rotating
shaft having the rotor mounted thereon.
In some examples, the rotating shaft of the motor may be rotatably
supported by at least one bearing. The rotating shaft may be
rotated at high speed while being supported by the bearing.
In some cases, when the temperature in the motor increases, the
performance of the motor may be deteriorated, and therefore, the
temperature in the motor may be maintained such that the motor is
not overheated.
Heat of the bearing is one of several factors that can increase the
temperature in the motor, and therefore, the heat of the bearing
may be dissipated such that the bearing is not overheated. For
example, when the rotating shaft is rotated at high speed in the
motor, the bearing may be overheated. In this case, the lifespan of
the bearing may be shortened.
SUMMARY
A motor is provided to enable heat of a bearing to be efficiently
dissipated by air flowing in the motor.
The motor may include a bearing supporter that can align the
position of a bearing while assisting the heat dissipation of the
bearing.
According to one aspect of subject matter described in this
application, a motor includes a motor body, a bracket installed in
the motor body, a rotating shaft, a bearing accommodated inside the
bracket and supporting the rotating shaft, and a bearing supporter
defining a plurality of pores. The bracket and the bearing define a
bearing heat dissipation flow path between an outer surface of the
bearing and an inner surface of the bracket, and the bearing heat
dissipation flow path is configured to pass air therethrough. The
bearing supporter is disposed in the bearing heat dissipation flow
path, and the bracket defines a bracket through-hole configured to
discharge air that has passed through the plurality of pores of the
bearing supporter.
Implementations according to this aspect may include one or more of
following features. The bearing supporter may include a metal wire
mesh in which at least one metal wire has one or more curved
portions. The bearing supporter may have a hollow cylindrical
shape, and the bearing supporter may have an inner surface that
contacts the outer surface of the bearing, and an outer surface
that contacts the inner surface of the bracket. In some
implementations, the bracket through-hole faces one or more of the
plurality of pores.
According to another aspect of subject matter described in this
application, a motor includes a motor housing, a rotating shaft
assembly that includes a rotating shaft, a rotor, and a bearing in
which the rotor and the bearing are mounted to the rotating shaft,
a bearing supporter defining a plurality of pores, a stator
installed in the motor housing, the stator surrounding the rotor,
an impeller connected to the rotating shaft, an impeller cover that
surrounds an outer circumference of the impeller and that defines
an air inlet between the impeller and the impeller cover, a
diffuser disposed inside the impeller cover, and a bracket coupled
to at least one of the motor housing, the impeller cover, or the
diffuser. The bearing and the bracket define a bearing heat
dissipation flow path between an outer surface of the bearing and
an inner surface of the bracket, and the bearing heat dissipation
flow path is configured to pass air. The bearing supporter is
disposed in the bearing heat dissipation flow path, the bracket
defines a bracket through-hole facing one or more of the plurality
of pores, and the bracket through-hole is configured to discharge
air that has passed through the plurality of pores of the bearing
supporter.
Implementations according to this aspect, the bearing supporter may
have an end part facing toward the rotor. The diffuser may include
a guide vane configured to guide air toward a gap between the
bearing supporter and the rotor. The bearing may include an inner
rim fixed to the rotating shaft, an outer rim spaced apart from the
inner rim, and a rolling member disposed between the inner rim and
the outer rim.
In some implementations, the bracket may include a bearing
supporter housing part that surrounds an outer circumference of the
bearing supporter, and a cover part that extends from the bearing
supporter housing part and covers a portion of the bearing between
the inner rim and the outer rim, the cover part being positioned
opposite the impeller. The bracket through-hole may be defined in
at least one of the bearing supporter housing part or the cover
part.
In some implementations, the cover part may define the bracket
through-hole at a position that faces the bearing supporter. In
some examples, the cover part and the impeller may define a first
gap configured to receive the air that has passed through the
bracket through-hole. The diffuser and the impeller may define a
second gap that is configured to discharge the air that has passed
through the first gap.
In some implementations, the bracket through-hole may be located
between the first gap and the bearing supporter, and face each of
the first gap and the bearing supporter. The bearing may include an
inner rim fixed to the rotating shaft, an outer rim spaced apart
from the inner rim, and a rolling member disposed between the inner
rim and the outer rim. The bracket may include a bearing supporter
housing part that surrounds the bearing supporter, and the bearing
supporter housing part may define the bracket through-hole. In some
cases, the diffuser may define a diffuser through-hole that extends
to a space between the diffuser and the impeller cover, and the
diffuser through-hole is configured to communicate with the bracket
through-hole.
In some implementations, the bearing supporter may include a metal
wire mesh in which at least one metal wire has one or more of
curved portions. The bearing supporter may have a hollow
cylindrical shape, and the bearing supporter may have an inner
surface that contacts the outer surface of the bearing, and an
outer surface that contacts the inner surface of the bracket.
In some implementations, the bearing may include an inner rim fixed
to the rotating shaft, an outer rim spaced apart from the inner
rim, and a rolling member disposed between the inner rim and the
outer rim. The bracket may include a bearing supporter housing part
that surrounds the bearing supporter, and the bearing supporter may
have an external diameter less than an internal diameter of the
bearing supporter housing part. The bearing heat dissipation flow
path may have a hollow cylindrical shape and be defined between an
outer circumference of the outer rim and an inner circumference of
the bearing supporter housing part.
In some implementations, the motor may further include a second
bearing mounted to the rotating shaft and a second bearing
supporter defining a plurality of pores. The motor housing may
include a hollow part that has an inner diameter greater than an
outer diameter of the rotating shaft. The second bearing may have
an outer diameter less than the inner diameter of the hollow part
and is located between the rotating shaft and the hollow part. The
hollow part and the second bearing may define a second bearing heat
dissipation flow path between an inner surface of the hollow part
and an outer surface of the second bearing in which the second
bearing supporter may be disposed in the second bearing heat
dissipation flow path.
In some implementations, the motor housing may define at least one
air outlet that faces the second bearing supporter. The second
bearing supporter may have an end part facing toward the rotor.
According to another aspect, a motor includes a motor housing, a
rotating shaft assembly including a rotating shaft, a rotor, and a
bearing in which the rotor and the bearing are mounted to the
rotating shaft, a stator installed in the motor housing, the stator
surrounding the rotor, an impeller connected to the rotating shaft,
an impeller cover surrounding an outer circumference of the
impeller and defining an air inlet between the impeller and the
impeller cover, a diffuser disposed inside the impeller cover, a
bracket mounted to at least one of the impeller cover, the motor
housing, or the diffuser, and a bearing supporter disposed between
the bracket and the bearing in which the bearing supporter defines
a plurality of pores. The bearing includes an inner rim fixed to
the rotating shaft, an outer rim spaced apart from the inner rim,
and a rolling member disposed between the inner rim and the outer
rim. The bracket includes a bearing supporter housing part that
surrounds the bearing supporter, and a cover part that extends from
the bearing supporter housing part and covers a portion of the
bearing between the inner rim and the outer rim.
The cover part defines at least one first bracket through-hole that
faces at least a portion of the bearing supporter, and the bearing
supporter housing part defines at least one second bracket
through-hole.
The diffuser defines a diffuser through-hole that extends to a
space between the diffuser and the impeller cover, the diffuser
through-hole being configured to communicate with the second
bracket through-hole, and the first and second bracket
through-holes extend toward different directions from each
other.
Implementations according to this aspect, the bearing supporter may
have an inner surface that contacts an outer surface of the outer
rim, and an outer surface that contacts an inner surface of the
bearing supporter housing part.
According to the present disclosure, as air inside the motor passes
through the plurality of pores formed in the bearing supporter,
heat of each of the bearing, the bearing supporter, and the bracket
can be dissipated. In some implementations, it may be possible to
minimize that the inside of the motor is overheated and to maximize
the lifespan of the bearing.
Further, it may be possible to efficiently dissipate heat of the
bearing through a simple structure in which the bearing supporter
is disposed between the bearing and the bracket, and the bracket
through-hole is formed in the bracket.
Further, when the position of the bearing is out of the regular
position due to an assembly tolerance of the motor, or the like,
the bearing can be aligned to the regular position by the bearing
supporter that is elastically deformed by the bearing. In some
implementations, the performance of the bearing can be
maximized.
Further, heat of the second bearing accommodated in the motor
housing can be efficiently dissipated by air passing between the
rotor and the stator.
Further, as the air inside the motor is rapidly flowed through the
two heat dissipation flow paths, the heat dissipation performance
of the bearing can be maximized.
The details of one or more implementations are set forth in the
accompanying drawings and the description below. Other features
will be apparent from the description and drawings, and from the
claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view showing an example motor.
FIG. 2 is an exploded perspective view showing the example
motor.
FIG. 3 is an enlarged sectional view of portion A of FIG. 1.
FIG. 4 is a view showing an example flow of air in the motor
dissipating heat of an example bearing.
FIG. 5 is a cross-sectional view showing an example bearing
supporter that is elastically deformed by the bearing.
FIG. 6 is a view showing an example flow of air in an example motor
dissipating heat of an example bearing.
FIG. 7 is a view showing an example flow of air in another example
motor dissipating heat of a bearing.
FIG. 8 is a sectional view showing another example motor.
FIG. 9 is an enlarged sectional view of portion B of FIG. 8.
FIG. 10 is a view showing an example flow of air in the example
motor dissipating heat of an example second bearing.
DETAILED DESCRIPTION
Hereinafter, exemplary implementations of the present disclosure
will be described in detail with reference to the accompanying
drawings.
FIG. 1 is a sectional view showing an example motor. FIG. 2 is an
exploded perspective view showing the example motor. FIG. 3 is an
enlarged sectional view of portion A of FIG. 1. FIG. 4 is a view
showing an example flow of air when the motor dissipates heat of an
example bearing in the motor. FIG. 5 is a cross-sectional view when
an example bearing supporter is elastically deformed by the
bearing.
The motor M of this implementation may include a motor body 1, a
rotating shaft 3, a bearing 5, a bracket 8, and a bearing supporter
9.
The motor M may be configured such that air in the motor M passes
between the bearing 5 and the bracket 8 and is then discharged to
the outside of the bracket 8.
In the motor M, an example bearing heat dissipation flow path S6
through which air passes may be formed between the outer surface of
the bearing 5 and the inner surface of the bracket 8. In some
implementations, the bearing supporter 9 having a plurality of
pores H formed therein may be disposed in the bearing heat
dissipation flow path S6. In some implementations, a bracket
through-hole 87 through which air passing through the plurality of
pores H is discharged to the outside of the bracket 8 may be formed
in the bracket 8.
Heat of the bearing 5 may be transferred to the bracket 8 through
the bearing supporter 9. Air in the motor M may be introduced into
the bearing heat dissipation flow path S6 through the plurality of
pores H formed in the bearing supporter 9, and may dissipate heat
of the bearing 5, the bearing supporter 9, and the bracket 8 while
passing through the bearing heat dissipation flow path S6. The air
of the bearing heat dissipation flow path S6 may get out of the
bracket 8 by passing through the bracket through-hole 87.
The motor body 1 may form an external appearance of the motor M. An
air inlet 11 through which external air is suctioned into the motor
body 1 may be formed in the motor body 1.
A space in which a stator 2, a rotor 4, the rotating shaft 3, the
bearing 5, the bracket 8, and an impeller 71 are accommodated may
be formed inside the motor body 1. An air outlet 12 through which
the air in the motor M is discharged to the outside of the motor
body 1 may be formed in the motor body 1.
In some implementations, the motor body 1 may be configured as an
assembly of a plurality of members. The motor body 1 may include an
impeller cover 13 in which the air inlet 11 is formed. The motor
body may further include a motor housing 14 in which the air outlet
12 is formed. The impeller cover 13 may be coupled to the motor
housing 14, and the motor housing 14 may constitute the motor body
1 together with impeller cover 13.
In some implementations, the motor body 1 may further include a
separate frame disposed between the impeller cover 13 and the motor
housing 14, and each of the impeller cover 13 and the motor housing
14 may be coupled to the frame.
In the motor M, a portion of the bracket 8 may be disposed between
the impeller cover 13 and the motor housing 14, and each of the
impeller cover 13 and the motor housing 14 may be coupled to the
bracket 8. In this case, the bracket 8 may constitute a portion of
the motor body 1.
The impeller cover 13 may surround the outer circumference of the
impeller 71. The impeller cover 13 can protect the impeller 71 by
surrounding the outer circumference of the impeller 71.
The impeller cover 13 may have an open surface toward the motor
housing 14. The impeller cover 13 may be disposed to cover the open
surface of the motor housing 14. The impeller cover 13 may be
coupled to the motor housing 14 or the bracket 8 using a fastening
member such as a screw, for example, or may be screw-coupled to the
motor housing 14 or the bracket 8.
The air inlet 11 may be formed smaller than the surface opposite to
the motor housing 14 in the impeller cover 13.
The inner circumferential surface of the impeller cover 13 may be
spaced apart from the impeller 71, and air flowed by the impeller
71 may flow between the inner circumferential surface of the
impeller cover 13 and the impeller 71.
The motor housing 14 may have a hollow cylindrical shape having an
open surface. The air outlet 12 through which air in the motor
housing 14 is discharged to the outside may be formed in the motor
housing 14. The air outlet 12 may be formed in plural numbers in
the motor housing 14.
In some implementations, the motor M may further include the stator
2 mounted in the motor body 1 and the rotor 4 mounted to the
rotating shaft 3.
The stator 2 may be mounted in the motor body 1. The stator 2 may
be mounted to the motor housing 14 to surround the outer
circumference of the rotor 4. The stator 2 may be mounted to the
motor housing 14 using a fastening member such as a screw. The
stator 2 may be formed in a hollow cylindrical shape. The stator 2
may be mounted to surround the outer circumference of the rotor
4.
The stator 2 may be configured as an assembly of a plurality of
members. The stator 2 may include a stator core 21, a pair of
insulator 22 and 23 coupled to the stator core 21, and a coil 24
disposed at the insulators 22 and 23.
The rotor 4 and the bearing 5 may be mounted to the rotating shaft
3, and the rotating shaft 3 may constitute a rotating shaft
assembly R together with the rotor 4 and the bearing 5.
The rotating shaft 3 may be disposed long from the inside of the
motor housing 14 to the inside of the impeller cover 13. A portion
of the rotating shaft 3 may be located inside the motor housing 14,
and another portion of the rotating shaft 3 may be located inside
the impeller cover 13.
The rotating shaft 3 is rotated together with the rotor 4, and may
be supported by the bearing 5. The rotating shaft 3 may be
rotatably located inside the motor body 1. The rotating shaft 3 may
be rotated by the rotor 4 in the state in which the rotating shaft
3 is supported by the bearing 5.
The impeller 71 may be connected to the rotating shaft 3. When the
rotating shaft 3 rotates, the impeller 71 may be rotated inside the
impeller cover 13.
An impeller connection part 32 to which the impeller 71 is
connected may be formed at the rotating shaft 3. The impeller
connection part 32 may be formed at a position spaced apart from a
part 31 surrounded by the rotor 4. The impeller connection part 32
may be formed at an end portion of the rotating shaft 3.
In some implementations, a second bearing mounting part at which a
second bearing 6 which will be described later is mounted may be
formed at the rotating shaft 3.
The rotor 4 may be mounted to surround a portion of the rotating
shaft 3. The rotor 4 may be rotatably located inside the stator 2.
The rotor 4 may be formed in a hollow cylindrical shape.
The rotor 4 may include an iron core 41 fixed to the rotating shaft
3, a magnet 42 installed at the iron core 41, and a pair of end
plates 43 and 44 that fix the magnet 42.
The rotor 4 may be mounted to surround the part 31 between one end
and the other end of the rotating shaft 3. The rotor 4 may be
mounted between the impeller connection part 32 and the second
bearing mounting part.
The bearing 5 may be accommodated inside the bracket 8, and may
support the rotating shaft 3. The bearing 5 may be accommodated
inside the bracket 8 together with the bearing supporter 9.
The bearing 5 may include an inner rim 51 fixed to the rotating
shaft 3, an outer rim 52 spaced apart from the inner rim 51, and a
rolling member 53 disposed between the inner rim 51 and the outer
rim 52.
The bearing 5 may be one of a roller bearing and a ball bearing.
The bearing 5 may be configured as a ball bearing in which the
rolling member 53 is configured as a ball to have high performance
in high-speed rotation.
The external diameter D1 of the outer rim 52 of the bearing 5 may
be smaller than the internal diameter D2 of a bearing supporter
housing part 81 which will be described later. In some
implementations, the bearing heat dissipation flow path S6 may be
formed between the outer circumferential surface of the outer rim
52 of the bearing 5 and the inner circumferential surface of the
bearing supporter housing part 81. The bearing heat dissipation
flow path S6 may be formed in a hollow cylindrical shape between
the outer rim 52 of the bearing 5 and the bearing supporter housing
part 81.
In some implementations, the motor M may further include an O-ring
54 fixed to the rotating shaft 3, the O-ring 54 restricting the
bearing 5.
The O-ring 54 may be fixed to the rotating shaft 3, and may
constitute a rotating shaft assembly (or rotor assembly) together
with the rotating shaft 3 and the rotor 4.
The O-ring 54 may be located between the bearing 5 and the rotor 4
in the length direction of the rotating shaft 3. In some examples,
the O-ring 54 may be a bearing stopper that restricts the bearing 5
from moving toward the rotor 4.
The O-ring 54 may be fixed to the rotating shaft 3 to come in
contact with a portion of the bearing 5. At least one portion of
the O-ring 54 may face the inner rim 51 of the bearing 5. The
O-ring 54 may come in contact with the inner rim 51 of the bearing
5. The O-ring 54 may be a bearing stopper that restricts the inner
rim 51 of the bearing 5 from sliding toward the rotor 4.
The external diameter D3 of the O-ring 54 may be smaller than the
internal diameter D4 of the bearing supporter 9.
The O-ring 54 may be located inside the bearing supporter 9. When
the rotating shaft 3 rotates, the O-ring 54 may be rotated in an
empty space formed inside the bearing supporter 9.
A gap G1 may be formed between the outer circumference of the
O-ring 54 and the bearing supporter 9, and the O-ring 54 and the
bearing supporter 9 may not come in contact with each other. When
the O-ring 54 and the bearing supporter 9 come in contact with each
other, at least one of the O-ring 54 and the bearing supporter 9
may be abraded. In some implementations, when the O-ring 54 and the
bearing supporter 9 do not come in contact with each other, the
lifespan of each of the O-ring 54 and the bearing supporter 9 can
be maximized.
The O-ring 54 may be mounted to the rotating shaft 3, come in
contact with the inner rim 51 of the bearing 5, and be spaced apart
from the bearing supporter 9.
In some implementations, the O-ring 54 may include an inner ring 55
coming in contact with the inner rim 51 of the bearing 5 and an
outer ring 56 spaced apart from the outer rim 52 of the bearing 5.
The outer circumference of the outer ring 56 may be the outer
circumference of the O-ring 54, and the external diameter of the
outer ring 56 may be the external diameter D3 of the O-ring 54.
In the motor M, a portion of the rotating shaft 3, which is located
inside the motor housing 14, may be directly supported by the motor
housing 14.
When the rotating shaft 3 is directly supported by the motor
housing 14, a rotating shaft support part rotatably supporting the
rotating shaft 3 may be formed in the motor housing 14. The
rotating shaft support part may be formed in the motor housing 14
to surround the outer circumference of the rotating shaft 3. A
lubrication medium for preventing abrasion between the rotating
shaft 3 and the rotating shaft support part, such as a lubricant,
may be provided to at least one of the rotating shaft 3 and the
rotating shaft support part.
In the motor M, the portion of the rotating shaft 3, which is
located inside the motor housing 14, may be supported through the
second bearing 6. The motor M may further include the second
bearing 6 installed at the rotating shaft 3, and the second bearing
6 may rotatably support the rotating shaft 3.
The second bearing 6 may be installed at the rotating shaft 3 to be
spaced apart from the bearing 5.
The bearing 5 and the second bearing 6 may rotatably support the
rotating shaft 3 at positions spaced apart from each other. In this
case, the weight of the rotating shaft 3 may be distributed by the
bearing 5 and the second bearing 6.
In the motor M, the bearing 5 and the second bearing 6 may be
mounted together between the rotor 4 and the impeller 71. In this
case, the bearing 5 and the second bearing 6 may be mounted to be
spaced apart from each other in the axial direction of the rotating
shaft 3 between the rotor 4 and the impeller 71.
In some implementations, in the motor M, the bearing 5 and the
second bearing 6 may be mounted to be spaced apart from each other
with the rotor 4 interposed therebetween. In this case, the bearing
5 and the second bearing 6 may support the rotating shaft 3 by
efficiently distributing the weight of the rotating shaft 3. When
the bearing 5 and the second bearing 6 are arranged with the rotor
4 interposed therebetween, the maximum weight applied to the
bearing 5 and the second bearing 6 is lower than that when the
bearing 5 and the second bearing 6 are mounted together between the
rotor 4 and the impeller 71, and the lifespan of each of the
bearing 5 and the second bearing 6 is longer than that when the
bearing 5 and the second bearing 6 are mounted together between the
rotor 4 and the impeller 71. In some implementations, when the
bearing 5 and the second bearing 6 are arranged with the rotor 4
interposed therebetween, a separate space for allowing the bearing
5 and the second bearing 6 to be spaced apart from each other may
not be required, and the motor M can be compact as compared with
when the bearing 5 and the second bearing 6 are mounted together
between the rotor 4 and the impeller 71.
The second bearing 6 may be located between the rotating shaft 3
and the motor housing 14 to support the rotating shaft 3. In this
case, the second bearing 6 may be spaced apart from the bearing 5
with the rotor 4 interposed therebetween.
When the motor M includes both of the bearing 5 and the second
bearing 6, the bearing 5 may be a load-side bearing close to the
impeller 71, and the second bearing 6 may be a non-load-side
bearing distant from the impeller 71, or vice versa.
In some implementations, when the motor M includes both of the
bearing 5 and the second bearing 6, the bearing 5 may be a
bracket-side bearing surrounded by the bracket 8, and the second
bearing 6 may be a motor housing-side bearing surrounded by motor
housing 14.
The bearing 5 may be a first bearing mounted between the impeller
71 and the second bearing 6, for example, or between the impeller
71 and the rotor 4, and the second bearing 6 may be an end bearing
mounted at an end portion of the rotating shaft 3, which is
opposite to the impeller 71.
When the rotating shaft 3 is supported by the second bearing 6, the
second bearing 6 may be mounted to the rotating shaft 3 to be
located inside the motor housing 14. A hollow part 15 larger than
the rotating shaft 3 may be formed in the motor housing 14. For
example, the hollow part 15 has an internal diameter greater than a
diameter of the rotating shaft 3. The motor housing 14 may include
a body part 16 from which the hollow part 15 protrudes.
In some examples, the hollow part 15 may be formed larger than the
second bearing 6. The second bearing 6 may be directly supported by
the motor housing 14, or may be supported by the motor housing 14
with a separate elastic member interposed therebetween.
When the second bearing 6 is directly supported by the motor
housing 14, the outer circumference of the second bearing 6 may
come in contact with the hollow part 15 to be supported by the
hollow part 15.
The second bearing 6 may include an inner rim 61 fixed to the
rotating shaft 3, an outer rim 62 spaced apart from the inner rim
61, and a rolling member 63 disposed between the inner rim 61 and
the outer rim 62.
In some implementations, the second bearing 6 may be one of a
roller bearing or a ball bearing. The second bearing 6 may be
configured as a ball bearing in which the rolling member 63 is
configured as a ball to have high performance in high-speed
rotation.
The inner rim 61 of the second bearing 6 may be fixed to the
rotating shaft 3, and the outer rim 62 of the second bearing 6 may
come in contact with the hollow part 15 to be fixed to the hollow
part 15.
In some implementations, the motor M may further include a second
O-ring 64 fixed to the rotating shaft 3, the second O-ring 64
supporting the second bearing 6. The second O-ring 64 may be fixed
to the rotating shaft 3, and may constitute a rotating shaft
assembly (or rotor assembly) together with the rotating shaft 3 and
the rotor 4.
The second O-ring 64 may be located between the second bearing 6
and the rotor 4 in the length direction of the rotating shaft 3.
The second O-ring 64 may be a second bearing stopper that restricts
the second bearing 6 from moving toward the rotor 4.
The second O-ring 64 may be fixed to the rotating shaft 3 to come
in contact with a portion of the second bearing 6. At least one
portion of the second O-ring 64 may face the inner rim 61 of the
second bearing 6. The second O-ring 64 may come in contact with the
inner rim 61 of the second bearing 6. The second O-ring 64 may be a
bearing stopper that restricts the inner rim 61 of the second
bearing 6 from sliding toward the rotor 4.
The second O-ring 64 may be mounted to the rotating shaft 3, come
in contact with the inner rim 61 of the second bearing 6, and be
spaced apart from the hollow part 15.
The second O-ring 64 may include an inner ring 65 coming in contact
with the inner rim 61 of the second bearing 6 and an outer ring 66
spaced apart from the outer rim 62 of the second bearing 6.
In some implementations, the impeller 71 may be connected to the
rotating shaft 3. The impeller 71 may be rotated together with the
rotating shaft 3 in the state in which the impeller 71 is connected
to the rotating shaft 3. The impeller 71 may be located between the
impeller cover 13 and a diffuser 74 which will be described later.
A gap S1 through which air flowed by the impeller 71 passes may be
formed between the impeller 71 and the impeller cover 13.
In some implementations, the motor M may further include the
diffuser 74 that guides the air flowed by the impeller 71. The air
flowed by the impeller 71 may be guided by the diffuser 74, and the
air guided by the diffuser 74 dissipates heat of the bearing 5
while passing between the bearing 5 and the bracket 8. The air
flowed by the impeller 71 may be flowed into the bearing supporter
9 by the diffuser 74. The air flowed into the bearing supporter 9
may be introduced into the pores H of the bearing supporter 9 to
pass through the bearing heat dissipation flow path S6, and then
discharged from the bearing heat dissipation flow path S6 to the
outside of the bracket 8 through the bracket through-hole 87.
The diffuser 74 may be disposed inside the impeller cover 13. The
diffuser 74 may be mounted to at least one of the impeller cover 13
and the bracket 8. A gap S2 through which air guided by the
diffuser 74 passes may be formed between the diffuser 74 and the
impeller cover 13.
The diffuser 74 may include a body part 75 having a smaller size
than the impeller cover 13, a diffuser vane 76 protruding from the
outer circumference of the body part 75, and a guide vane 77
guiding air flowed by the diffuser vane 76.
The diffuser vane 76 may be formed to change the dynamic pressure
of air passing through the impeller 71 to static pressure.
The guide vane 77 may guide air of which pressure is increased by
the diffuser vane 76 toward at least one of the bearing supporter 9
and the rotor 4. The guide vane 77 may guide air toward a gap S4
between the bearing supporter 9 and the rotor 4.
The air guided by the guide vane 77 may pass through a gap S3
between the diffuser 74 and the stator 2 and then pass through the
gap S4 between the bearing supporter 9 and the rotor 4.
Some of the air flowed by the guide vane 77 may be flowed into the
bearing supporter 9 to dissipate heat of the bearing 5, the bearing
supporter 9, and the bracket 8. Some of the air flowed by the guide
vane 77, for example, air that is not introduced into the bearing
supporter 9 may be flowed into a gap S5 between the rotor 4 and the
stator 2 to dissipate heat of the rotor 4 and the stator 2.
The bracket 8 may be installed in the motor body 1. The bracket 8
may be installed in the motor body 1 to be located inside the motor
body 1. The bracket 8 may be coupled to at least one of the motor
housing 14, the impeller cover 13, and the diffuser 74.
The bracket 8 may simultaneously accommodate the bearing 5 and the
bearing supporter 9 therein.
The bracket 8 may include the bearing supporter housing part 81
surrounding the outer circumference of the bearing supporter 9. The
bracket 8 may include a cover part 82 formed at the bearing
supporter housing part 81. The bracket 8 may include a fastening
part 84 fastened to at least one of the motor housing 14 and the
impeller cover 13. The bracket 8 may include at least one
connection part 86 that connects the fastening part 84 and the
bearing supporter housing part 81.
The internal diameter D2 of the bearing supporter housing part 81
may be greater than the external diameter D1 of the outer rim 52 of
the bearing 5. The bearing supporter housing part 81 may be formed
larger than the O-ring 54, and the internal diameter of the bearing
supporter housing part 81 of the bracket 8 may be greater than the
external diameter of the O-ring 54. The O-ring 54 may be rotated in
a space formed inside the bearing supporter housing part 81. A gap
may be formed between the inner circumferential surface of the
bearing supporter housing part 81 of the bracket 8 and the outer
circumference of the O-ring 54. The gap may be greater than the
thickness of the bearing supporter 9.
The cover part 82 may cover between the inner rim 51 and the outer
rim 52 of the bearing 5 and face the impeller 71.
The cover part 82 may be formed in a shape bent from the bearing
supporter housing part 81. The cover part 82 may be formed in a
ring shape at one end of the bearing supporter housing part 81.
A rotating shaft through-hole 83 through which the rotating shaft 3
rotatably passes may be formed in the cover part 82. The diameter
D5 of the rotating shaft through-hole 83 may be smaller than the
internal diameter D2 of the bearing supporter housing part 81.
The cover part 82 may be spaced apart from the O-ring 54, and a
bearing accommodation space in which the bearing 5 is accommodated
may be formed between a surface of the O-ring 54 facing the bearing
5 and a surface of the cover part 82 facing the bearing 5.
The fastening part 84 may be formed in a ring shape. The fastening
part 84 may be fastened to at least one of the motor housing 14 and
the impeller cover 13 using a fastening member 85 such as screw.
The fastening part 84 may be formed larger than the bearing
supporter housing part 81.
In some implementations, a first gap S7 through which air having
passed through the bracket through-hole 87 passes may be formed
between the cover part 82 and the impeller 71. In some
implementations, a second gap S8 through which the air having
passed through the first gap S7 is discharged toward a space
between the diffuser 74 and the impeller cover 13 may be formed
between the diffuser 74 and the impeller 71.
The bracket through-hole 87 may be formed in at least one of the
bearing supporter housing part 81 and the cover part 82. Also, the
bracket through-hole 87 may be formed to face at least some of the
plurality of pores H.
At least one bracket through-hole 87 may be formed in an area of
the cover part 82, which faces the bearing supporter 9. The bracket
through-hole 87 may be formed to face each of the first gap S7 and
the bearing supporter 9.
The bearing supporter 9 may have a hollow cylindrical shape. The
inner surface of the bearing supporter 9 may come in contact with
the outer surface of the bearing 5, and the outer surface of the
bearing supporter 9 may come in contact with the inner surface of
the bracket 8.
A cylindrical empty space may be formed inside the bearing
supporter 9. The bearing supporter 9 may be disposed between the
outer rim 52 of the bearing 5 and the bearing supporter housing
part 81 of the bracket 8. The bearing supporter 9 may be disposed
to come in contact with at least one of the outer rim 52 of the
bearing 5 and the bearing supporter housing part 81 of the bracket
8. The inner surface of the bearing supporter 9 may come in contact
with the outer surface of the outer rim 52 of the bearing 5, and
the outer surface of the bearing supporter 9 may come in contact
with the inner surface of the bearing supporter housing part 81 of
the bracket 8.
The bearing supporter 9 may be formed to allow air to pass
therethrough and to be elastically deformed by the bearing 5. The
bearing supporter 9 may be elastically deformed by the plurality of
pores H. In this case, the bearing supporter 9 may adjust the
position of the bearing 5 to a regular position in the state in
which the bearing supporter 9 is elastically deformed by the
bearing 5.
The bearing 5 and the second bearing 6 may be mounted such that
their center axes correspond to each other. When an error in
concentricity between the bearing 5 and the second bearing 6 is
large, the abrasion of any one of the bearing 5 and the second
bearing 6 may be large.
In the motor M, the center axis H1 of the bearing supporter housing
part 81 and the center axis of the hollow part 15 do not correspond
to each other due to an assembly tolerance of the motor housing 14
and the bracket 8. For example, when the bearing 5 and the second
bearing 6 are mounted with the rotor 4 interposed therebetween, the
error in concentricity between the bearing 5 and the second bearing
6 may be large.
Although the center axis H1 of the bearing supporter housing part
81 and the center axis of the hollow part 15 do not correspond to
each other, the bearing supporter 9 may adjust the position of the
bearing 5 to be aligned with the position of the second bearing 6
such that the center axis B1 of the bearing 5 and the center axis
of the second bearing 6 maximally correspond to each other.
The bearing supporter 9 may be disposed between the bracket 8 and
the bearing 5, and may support bearing 5. The bearing supporter 9
may be press-fitted between the bracket 8 and the bearing 5.
In the motor M, the concentricities of the bearing 5 and the second
bearing 6 may not correspond to each other due to the assembly
tolerance of the motor housing 14 and the bracket 8. When the
concentricities of the bearing 5 and the second bearing 6 may not
correspond to each other as described above, the bearing supporter
9 may support the bearing 5 such that the center axis B1 of the
bearing 5 and the center axis of the second bearing 6 maximally
correspond to each other in a state in which a portion of the
bearing supporter 9 is elastically compressed.
That is, the bearing 5, as shown in FIG. 5, may pressurize a
portion of the bearing supporter 9 in a state in which the center
axis B1 of the bearing 5 and the center axis H1 of the bearing
supporter housing part 81 do not correspond to each other. In this
case, the bearing supporter 9 may support the bearing 5 in the
state in which the portion pressurized by the bearing 5 is
compressed.
The bearing supporter 9 may include a metal wire mesh in which at
least one metal wire 91 is irregularly tangled.
The height L1 of the bearing supporter 9 may be higher than the
height L2 of the bearing 5. A portion of the bearing supporter 9
may be disposed between the outer rim 52 of the bearing 5 and the
bearing supporter housing part 81 of the bracket 8. The internal
diameter D4 of the bearing supporter 9 may be equal to or smaller
than the external diameter D1 of the outer rim 52 of the bearing 5.
In some implementations, the external diameter of the bearing
supporter 9 may be equal to or smaller than the internal diameter
D2 of the bearing supporter housing part 81 of the bracket 8. A
portion of the bearing supporter 9 may be press-fitted between the
outer rim 52 of the bearing 5 and the bearing supporter housing
part 81 of the bracket 8. The portion of the bearing supporter 9
may be fixed by the outer rim 52 of the bearing 5 and the bearing
supporter housing part 81 of the bracket 8 in the state in which it
is press-fitted.
The bearing supporter 9 may include a first area 9A that faces the
bearing 5 and a second area 9B that does not face the bearing
5.
The first area 9A of the bearing supporter 9 may face the outer rim
52 of the bearing 5 and the bearing supporter housing part 81. The
second area 9B of the bearing supporter 9 may include an area that
faces the O-ring 54. The second area 9B of the bearing supporter 9
may further include an area that does not face both of the outer
surface of the bearing 5 and the O-ring 54.
The bearing supporter 9 may come in contact with the cover part 82.
When the bearing supporter 9 comes in contact with the cover part
82, the bearing supporter 9 may be held by the cover part 82, and
the mounting position of the bearing supporter 9 may be determined
by the cover part 82.
In some implementations, the bearing supporter may be protected by
the outer rim 52 of the bearing 5, the bearing supporter housing
part 81, and the cover part 82.
Heat of the bearing 5 may be transferred to the metal wire 91, and
the heat transferred to the metal wire 91 may be transferred to the
bracket 8 through a bracket contact part 92 of the metal wire 91,
which comes in contact with the bracket 8.
In some implementations, the heat transferred to the metal wire 91
may be dissipated in an air cooling manner through the second area
9B of the metal wire 91, which does not face the bearing 5.
That is, the heat of the bearing 5 may be transferred to the
bracket 8 through the bearing supporter 9, and the heat transferred
to the bracket 8 may be transferred to air in the motor M through
the bearing supporter 9.
The plurality of pores H may be open in the radial and axial
directions of the bearing supporter 9. The plurality of pores H may
include at least one first pore that faces the outer rim 52 of the
bearing and at least one second pore that does not face the outer
rim 52 of the bearing 5.
The air guided by the diffuser 74 may be introduced into the
bearing supporter 9 through the second pore, and then dissipate
each of the bearing 5, the bearing supporter 9, and the bracket 8
while passing through the first pore.
The bearing supporter 9 may have an end part 95 opposite to the
rotor 4. Air flowed in the gap S4 between the bearing support 9 and
the rotor 4 in the air in the motor M may be introduced into the
bearing supporter 9 through the end part 95 of the bearing
supporter 9, which is opposite to the rotor 4.
Hereinafter, an example operation of the example motor will be
described as follows.
First, when the motor M is driven, the rotating shaft 3 may be
rotated, and the impeller 71 may be rotated together with the
rotating shaft 3. When the impeller 71 is rotated, air outside the
motor M may be suctioned into the impeller 71 through the air inlet
11.
The air suctioned into the impeller 71 may be flowed into the
diffuser 74 by the impeller 71, and the air flowed into the
diffuser 74 may pass through the gap S2 between the diffuser 74 and
the impeller cover 13 while being guided by the diffuser 74. The
air guided by the diffuser 74 may be sequentially guided by the
diffuser vane 76 and the guide vane 77.
The air guided by the guide vane 77 may pass through the gap S3
between the diffuser 74 and the stator 2. Some of the air passing
through the gap S3 between the diffuser 74 and the stator 2 may be
introduced into the bearing supporter 9 by passing through the gap
S4 between the bearing supporter 9 and the rotor 4, and some of the
air passing through the gap S3 between the diffuser 74 and the
stator 2 may be flowed into the gap S5 between the rotor 4 and the
stator 2.
The air introduced into the bearing supporter 9 may be introduced
into the bearing heat dissipation flow path S6 by passing through
the plurality of pores H formed in the bearing supporter 9. The air
introduced into the bearing supporter 9 may come in contact with
each of the bearing 5, the bearing supporter 9, and the bracket 8
while passing through the plurality of pores H, and absorb heat of
each of the bearing 5, the bearing supporter 9, and the bracket
8.
The air passing through the plurality of pores H formed in the
bearing supporter 9 may be discharged to the outside of the bracket
8 by passing through the bracket through-hole 87, be introduced
into the first gap S7 between the cover part 82 and the impeller 71
to pass through the first gap S7, and be then introduced into the
second gap S8 between the diffuser 74 and the impeller 71 to pass
through the second gap S8. The air passing through the second gap
S8 may be flowed into the gap S2 between the diffuser 74 and the
impeller cover 13 to be mixed with the air guide by the impeller
71, and the mixed air may be guided to the diffuser 74.
FIG. 6 is a view showing an example flow of air when a motor
dissipates heat of an example bearing.
An example bracket 8 may include a bearing supporter housing part
81 surrounding a bearing supporter 9, and a bracket through-hole 88
may be formed in the bearing supporter housing part 81. In some
implementations, a diffuser through-hole 78 that allows a space
between a diffuser 74 and an impeller cover 13 to communicate with
the bracket through-hole 88 may be formed in the diffuser 74.
The bracket through-hole 88 of this implementation may be formed to
be open in the radial direction of the bearing supporter housing
part 81. In some implementations, the diffuser through-hole 78 may
be formed to be open in the radial direction of the diffuser 74,
for example, or a body part 75.
In this implementation, the other components except the bracket
through-hole 88 and the diffuser through-hole 78 and their
operations are identical or similar to those of the aforementioned
implementation. Therefore, the components except the bracket
through-hole 88 and the diffuser through-hole 78 are designated by
like reference numerals, and their detailed descriptions will be
omitted.
Air introduced into the bearing supporter 9 may absorb heat of each
of a bearing 5, the bearing supporter 9, and a bracket 8 while
passing through the plurality of pores H. The air may sequentially
pass through the bracket through-hole 88 formed in the bearing
supporter housing part 81 and the diffuser through-hole 78 formed
in the diffuser 74 and be then flowed into a gap S2 between the
diffuser 74 and the impeller cover 13.
The air flowed into the gap S2 between the diffuser 74 and the
impeller cover 13 may be mixed with air guided by the impeller
cover 13 and then guided to the diffuser 74.
FIG. 7 is a view showing an example flow of air when another
example motor dissipates heat of an example bearing.
An example bracket 8 may include a bearing supporter housing part
81 surrounding a bearing supporter 9, and a cover part 82 formed in
the bearing supporter housing part 81 to cover between inner and
outer rims 51 and 52 of a bearing 5.
In the bracket 8, at least one first bracket through-hole 87 that
faces at least one portion of the bearing supporter 9 may be formed
in the cover part 82, and at least one second bracket through-hole
88 may be formed in the bearing supporter housing part 81.
In some implementations, a diffuser through-hole 78 that allows a
space between a diffuser 74 and an impeller cover 13 to communicate
with the second bracket through-hole 88 may be formed in the
diffuser 74.
The first bracket through-hole 87 and the second bracket
through-hole 88 may be open in directions different from each
other.
The first bracket through-hole 87 may be open in a direction
parallel to a rotating shaft 3 in the cover part 82.
The second bracket through-hole 88 may be open in the radial
direction of the diffuser 74 in the bearing supporter housing part
81. The second bracket through-hole 88 may be open in a direction
perpendicular to the rotating shaft 3 in the bearing supporter
housing part 81.
In this implementation, the motor may include a first heat
dissipation flow path including a bearing heat dissipation flow
path S6, the first bracket through-hole 87, a first gap S7, and a
second gap S8, and a second heat dissipation flow path including
the bearing heat dissipation flow path S6, the second bracket
through-hole 88, and the diffuser through-hole 78.
The first heat dissipation flow path and the second heat
dissipation flow path may be separated from each other at the
bearing heat dissipation flow path S6. Air inside the motor M can
more reliably pass through the bearing heat dissipation flow path
S6, and the heat dissipation performance of the bearing 5 can be
maximized.
FIG. 8 is a sectional view showing an example motor. FIG. 9 is an
enlarged sectional view of portion B of FIG. 8. FIG. 10 is a view
showing an example flow of air when the motor dissipates heat of an
example second bearing.
In this implementation, an example hollow part 15 larger than a
rotating shaft 3 may be formed in a motor housing 14, and a second
bearing 6' of which external diameter D6 is smaller than the
internal diameter D7 of the hollow part 15 may be mounted to the
rotating shaft 3. In some implementations, a second bearing heat
dissipation flow path S9 through which air passes may be formed
between the inner surface of the hollow part 15 and the outer
surface of the second bearing 6', and a second bearing supporter 9'
in which a plurality of pores H are formed may be disposed in the
second bearing heat dissipation flow path S9.
In this implementation, the other components except the second
bearing 6' and the second bearing supporter 9' and their operations
are identical or similar to those of the aforementioned
implementation. Therefore, the components except the second bearing
6' and the second bearing supporter 9' are designated by like
reference numerals, and their detailed descriptions will be
omitted.
Only the installation position of the second bearing supporter 9'
is different from that of the bearing supporter 9 of the
aforementioned implementation, and the detailed structure and
function of the second bearing supporter 9' may be identical to
those of the bearing supporter 9 of the aforementioned
implementation. Therefore, its detailed description will be
omitted.
In this implementation, the motor may include both of the bearing
supporter 9 and the second bearing supporter 9', and the bearing
supporter 9 and the second bearing supporter 9' may align the
bearing 5 and the second bearing 6' at positions different from
each other. The position of the bearing 5 aligned by the bearing
supporter 9 is identical to that of the aforementioned
implementation, and therefore, its detailed description will be
omitted.
An example second O-ring 64 of this implementation may include an
inner ring 65 mounted to the rotating shaft 3 and an outer ring 66
spaced apart from an outer rim 62 of the second bearing 6'. Also,
the second O-ring 64 may be mounted to the rotating shaft 3 to be
located inside the second bearing supporter 9'.
A gap G2 may be formed between the outer circumference of the
second O-ring 64 and the second bearing supporter 9'.
The second O-ring 64 does not come in contact with the inner
circumference of the second bearing supporter 9', and thus the
abrasion of the second bearing supporter 9' and the second O-ring
64 can be minimized. In some implementations, the gap G2 can assist
air passing through a gap S5 between a stator 2 and a rotor 4 to be
introduced into the plurality of pores H formed in the second
bearing supporter 9'.
The second bearing 6', as shown in FIG. 10, may pressurize a
portion of the second bearing supporter 9' in a state in which the
center axis B2 of the second bearing 6' does not correspond to the
center axis H2 of the hollow part 15. In this case, the second
bearing supporter 9' may support the second bearing 6' in the
portion pressurized by the second bearing 6' is compressed.
For example, the center axis H2 of the hollow part 15 shown in FIG.
10 may not correspond to the center axis H1 of the bearing
supporter housing part 81 shown in FIG. 5 due to an assembly
tolerance of a motor housing 14 and a bracket 8. In this case, the
position of the second bearing 6' can be aligned together with the
rotating shaft 3 in the state in which the second bearing 6' is
supported by the second bearing supporter 9', and the
concentricities of the bearing 5 and the second bearing 6' can
correspond to each other.
In some implementations, as at least one of the bearing supporter 9
and the second bearing supporter 9' is elastically deformed, the
concentricities of the bearing 5 and the second bearing 6' can
correspond to each other.
In some implementations, as each of the bearing supporter 9 and the
second bearing supporter 9' is elastically deformed according to
the assembly tolerance of the motor housing 14 and the bracket 8,
the concentricities of the bearing 5 and the second bearing 6' can
correspond to each other.
For example, the position of the bearing 5 can be aligned by the
bearing supporter 9, and the position of the second bearing 6' can
be aligned by the second bearing supporter 9'. In this case, the
concentricities of the bearing 5 and the second bearing 6' can
smoothly correspond to each other, as compared with the
aforementioned implementation.
The second bearing supporter 9' may have a hollow cylindrical
shape. The inner surface of the second bearing supporter 9' may
come in contact with the outer surface of the second bearing 6',
and the outer surface of the second bearing supporter 9' may come
in contact with the inner surface of the hollow part 15.
The second bearing supporter 9' may have an end part 95 opposite to
the rotor 4.
In some implementations, in the motor housing 14, at least one air
outlet 18 may be formed in an area facing the second bearing
supporter 9'. The air outlet 18 may be formed in a body part 16 of
the motor housing 14. When the air outlet 18 is formed, the air
passing through the gap S5 between the stator 2 and the rotor 4 can
be more easily introduced into the second bearing heat dissipation
flow path S9.
The air passing through the gap S5 between the stator 2 and the
rotor 4 can efficiently dissipate heat of each other the second
bearing 6', the second bearing supporter 9', and the motor housing
14 while passing through the plurality of pores H formed in the
second bearing supporter 9'.
Although some implementations of the present disclosure are
described for illustrative purposes, it will be apparent to those
skilled in the art that various modifications and changes can be
made thereto within the scope of the disclosure without departing
from the essential features of the disclosure.
Accordingly, the aforementioned implementations should be construed
not to limit the technical spirit of the present disclosure but to
be provided for illustrative purposes so that those skilled in the
art can fully understand the spirit of the present disclosure.
The scope of the present disclosure should not be limited to the
aforementioned implementations but defined by appended claims. The
technical spirit within the scope substantially identical with the
scope of the present disclosure will be considered to fall in the
scope of the present disclosure defined by the appended claims.
* * * * *